STEVAL-CCA018V1 Single-supply stereo digital audio line driver based on the TS4657 Data brief Features ■ Power supply range: 3 V to 5.5 V ■ Audio line output: 2.2 VRMS for entire VCC range ■ 16 to 24-bit audio data format stereo DAC, 32 to 48 kHz sample rate ■ I2S, right or left justified compatible digital audio interface ■ 95 dB SNR A-weighted at 48 kHz, VCC = 5 V ■ 7.4 mA current consumption at VCC = 3 V, full operation ■ Internal negative power supply to ensure ground-referenced, cap-less outputs ■ No external capacitor needed for the negative power supply generation ■ Integrated structure to suppress pop and click noise ■ Standby mode active low ■ RoHS compliant STEVAL-CCA018V1 The digital audio data can be 16 to 24-bits long and sample rates from 32 to 48 kHz are supported. The output stage signal is ground-referenced by using an internal self-generated negative power supply, so bulky external output coupling capacitors are not necessary. Description The STEVAL-CCA018V1 demonstration board is designed provide a platform for evaluating the performance of the TS4657 stereo digital-to analog-converter (DAC). The TS4657 integrates a high-performance audio line driver capable of generating a 2.2 VRMS output level from a single 3.0 to 5.5 V supply. A single supply is sufficient for the digital and analog parts of the circuit, eliminating the need for external regulators. The TS4657 is a low consumption device, with only 22 mW of power dissipation at 3.0 V power supply during full operation. A 16-bit multi-bit sigma-delta DAC is used, operating at 256xFs with over sampling digital interpolation filters. October 2009 Doc ID 16593 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Schematic diagram 1 STEVAL-CCA018V1 Schematic diagram Figure 1. Circuit schematic VCCD VCCA C3 1uF 1uF VCCA VCCD 10uF/6V3 C4 C5 1uF 1uF 18 19 2 20 J5 13 C1 14 3v to 5V5 VCC GND C2 3 J4 4 Digital Input SDAT J3 5 BCLK J2 6 J1 VREGA Digital SDAT Audio BCLK Interface Digital VOUTL J6 SIP2 R6 nc VREGD VCCA 820 R5 LRCLK OUT L JP5 12 Filters and DACs VOUTR JP7 11 MCLK OUT R R7 820 100K R1 100K R2 100K R3 100K R4 MCLK C6 2nF2 JP4 R8 nc LRCLK VCCD nc nc IC1 TS4657 Control JP6 C7 Interface 1 2 3 1 2 3 1 2 3 VCCD JP1 Format1 JP2 JP3 Format2 /Stdby User Control 2/4 GNDD GNDD GNDA GNDA GNDA 1 17 10 15 16 FORMAT2 /STDBY 9 7 8 FORMAT1 2nF2 Doc ID 16593 Rev 1 Output Filters Epad J7 SIL2 STEVAL-CCA018V1 2 Revision history Revision history Table 1. Document revision history Date Revision 29-Oct-2009 1 Changes Initial release. Doc ID 16593 Rev 1 3/4 STEVAL-CCA018V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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